op 	 {
  name: "IdentityN"
  input_arg {
    name: "input"
    type_list_attr: "T"
  }
  output_arg {
    name: "output"
    type_list_attr: "T"
  }
  attr {
    name: "T"
    type: "list(type)"
    has_minimum: true
    minimum: 1
  }
}
